File talk:Multi-environment air supply mask.JPG

Non flexible nose-section
The non-flexible nose section means that the the pressure in the ears can not be equalised using the valsalva manoeuvre. Thus, the mask cannot be used for diving to great depths (despite that this isn't intented herefore). A solution could be to have the ears included to the mask, but this would also make it less small so that it will probably not be brought along everywhere.